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Portable and Emergency Power Considerations for the FT-991A

Beginning a discussion of the Yaesu FT-991A's power consumption
and requirements for portable and emergency power use let's start out by
quoting Yaesu's specifications as listed in the manual for reference.
For the sake of all of my discussions please assume the unit requires a
negative ground and the stock microphone is used. The power supply
is an AC to DC switching unit fixed at 13.8VDC and is capable of
supplying 30A.

The antenna was connected to a dummy load.
Non-squelched volume level set to 50% on internal speaker. We chose RTTY as the operating mode to represent
maximum modulation.